I have a 29 gallon tall tank with a regular fluorescent light, planted with lots of anubias, moss, java fern and crypt wendetii. Everything is doing well except for the java fern, which never grows well for me. However, I need some tall background plants to disguise the filter hoses. The stem plants I put in there as a temporary solution aren't doing well. What kind of tall plant can I use in a low light set up?